/*
 * The MIT License
 *
 * Copyright 2012-2014 Zafar Khaja (zafarkhaja@gmail.com).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * */

package com.github.zafarkhaja.semver.expr;

import com.github.zafarkhaja.semver.Version;

/**
 * Expression for the logical "negation" operator.
 *
 * @author Zafar Khaja (zafarkhaja@gmail.com)
 * @since 0.7.0
 */
public class Not implements Expression {

  /**
   * The expression to negate.
   */
  private final Expression expr;

  /**
   * Constructs a {@code Not} expression with an expression to negate.
   *
   * @param expr
   *          the expression to negate
   */
  Not(Expression expr) {
    this.expr = expr;
  }

  /**
   * Negates the given expression.
   *
   * @param version
   *          the version to interpret against
   * @return {@code true} if the given expression evaluates to {@code false} and {@code false}
   *         otherwise
   */
  @Override
  public boolean interpret(Version version) {
    return !expr.interpret(version);
  }

  public Expression getExpr() {
    return expr;
  }
}
